Parol evidence rule: It prohibits introducing prior or contemporaneous external agreements to modify or vary a fully integrated written contract, but there are exceptions for ambiguity, fraud, or conditions precedent.

• A. It prohibits extrinsic evidence to modify a partially integrated contract.
• B. The parol evidence rule prohibits introducing prior or contemporaneous external agreements to modify or vary a fully integrated written contract, with exceptions for ambiguity, fraud, or conditions precedent.
• C. It applies only to oral contracts.
• D. It requires extrinsic evidence for interpreting all terms.

Answer: (B)